What is an "isotropic" filter?

[a uio]

Hi,

What does it mean when people refer to a filter as being "isotropic"?

Cheers,
A

[Guest]

An isotropic filter treats all axes equally.

An example of a filter that is not isotropic, e.g., anisotropic, is an averaging kernel that is wider along the x axis than along the y axiz.